keys: Add "fioctl keys tuf download-roots" command

client/foundries_tuf_root.go

@@ -121,6 +121,10 @@ func (a *Api) TufProdRootGet(factory string) (*AtsTufRoot, error) {
 	return a.tufRootGet(factory, true, -1)
 }
 
+func (a *Api) TufProdRootGetVer(factory string, version int) (*AtsTufRoot, error) {
+	return a.tufRootGet(factory, true, version)
+}
+
 func (a *Api) TufRootPost(factory string, root []byte) (string, error) {
 	return a.tufRootPost(factory, false, root)
 }

subcommands/keys/tuf_download_roots.go

@@ -0,0 +1,73 @@
+package keys
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"fmt"
+	"os"
+
+	canonical "github.com/docker/go/canonical/json"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+
+	"github.com/foundriesio/fioctl/client"
+	"github.com/foundriesio/fioctl/subcommands"
+)
+
+func init() {
+	downloadRoots := &cobra.Command{
+		Use:   "download-roots <archive path>",
+		Short: "Download all versions of the Factory's TUF root metadata into a tarball",
+		Run:   doDownloadRoots,
+		Args:  cobra.ExactArgs(1),
+	}
+	downloadRoots.Flags().BoolP("prod", "", false, "Download the production versions")
+	tufCmd.AddCommand(downloadRoots)
+}
+
+func doDownloadRoots(cmd *cobra.Command, args []string) {
+	factory := viper.GetString("factory")
+	prod, _ := cmd.Flags().GetBool("prod")
+	dstPath := args[0]
+
+	var getRoot func(factory string, version int) (*client.AtsTufRoot, error)
+	if prod {
+		getRoot = api.TufProdRootGetVer
+	} else {
+		getRoot = api.TufRootGetVer
+	}
+
+	file, err := os.Create(dstPath)
+	subcommands.DieNotNil(err)
+	defer file.Close()
+
+	gzipWriter := gzip.NewWriter(file)
+	defer gzipWriter.Close()
+
+	tarWriter := tar.NewWriter(gzipWriter)
+	defer tarWriter.Close()
+
+	for ver := 1; ; ver++ {
+		var root *client.AtsTufRoot
+		root, err = getRoot(factory, ver)
+		if err != nil {
+			if herr := client.AsHttpError(err); herr != nil && herr.Response.StatusCode == 404 {
+				break
+			}
+			subcommands.DieNotNil(err)
+		}
+
+		bytes, err := canonical.MarshalCanonical(root)
+		subcommands.DieNotNil(err)
+
+		fmt.Printf("= Adding %d.root.json\n", ver)
+		header := &tar.Header{
+			Name: fmt.Sprintf("%d.root.json", ver),
+			Size: int64(len(bytes)),
+			Mode: 0644,
+		}
+		subcommands.DieNotNil(tarWriter.WriteHeader(header))
+		_, err = tarWriter.Write(bytes)
+		subcommands.DieNotNil(err)
+	}
+}